X-ray transformer



Patented Apr. 20,

W. D. COOLIDGE.

X-RAY TRANSFORMER.

APPLICATION FILED JUNE27, 1919.

Fig. 2.

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Inventor. William D. Coolidge,

UNITED STATESWPTENT OFFICE WILLIAM D. COOLIDGE, 0F SCHENEC'IADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

X-IRAY TRANSFORMER.

Specification of Letters Patent.

Application filed .Tune 27, 1919. Serial No. 307,092.

To all whom it may concern:

Be it known that I, WILLIAM D. CooLmoE,

a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and .useful Improvements in X-Ray Transformers, of which the following is a specification.

My invention relates to casings for transformers, reactors, and the like, and has for its general object an improved construction therefor which results in a very compact and economical arrangement of parts.

More specifically my invention relates to casings for portable transformers, induction coils, etc., which are adapted for use in connection with X-ray work; one of the specific objects of my invention then being to produce a casing which is small andlight hav ing but little internal clearance and hence follows the form of the core and windings closely.

In a casing of this character designed to following the core and windings closely, internal edges and bends in the neighborhood of the windings generally produce undue electrical strains locally in parts of the windings.

In the novel arrangement of my invention such strains are entirely avoided and advantage is at the same time taken of this arrangement to provide suitable lead housings and core anchoring devices.

For a more complete understanding of the nature and objects of my invention reference should be had to the following detailed description when taken in connection with the accompanying drawing in which:

Figure l is a perspective view of a transformer casing which embodies my invention. Fig. 2 is a vertical section of the same, the transformer core and windings being shown in elevation. Fig. 3 is a top plan view of the casing with the cover removed. Fig. 4 shows, in perspective, the detailed construction of an anchoring device employed in the practice of my-invention; while Fig. 5 is an explanatory diagram showing electrical connections.

Referring now to the drawings, 10 denotes generally the wall of the casing for the transformer which has the rectangular core 11; on one leg of which core is the primary winding 12 and the secondary windings 13.

The casing 10 is shaped to follow closely the configuration of the transformer and its w1ndmgs, 1n order to decrease the volume of oil, and consequently the weight, necessary to cool and insulate the transformer.

To this end the casing is formed with a trough or channel portion 15 serving as a seat for the core, which extends along the bottom of the belied-out portion 16 and up across each end. The belled-out portion 16 is generally cylindrical and follows in general the contour of the windings. The ends of the cylindrical portion are hence close to the windings, as at 17 and 18; the channel portion 15 forming chambers 19 and 20 over the yoke portions of the core, which chambers are offset from the general interior of the casing 10. The casing 10 consequently has four sharp interior edges, indicated at 21, 22, 23 and 24, adjacent the windiugs 12 and 13.

To counteract the electrical effect of these edges adjacent the windings, and at the same time to secure the core 11 in'place I employ anchoring devices, such as shown in perspective in Fig. 1, which make the end surfaces of the casing flush. These'anchoring devices each comprises a U-shaped member 25, the bottom of which sits on the core 11 and a tail member. 26 secured to the U-member, which fits down behind the core 11 and prevents the U-members from being displaced longitudinally along the core. Each U-me'mber 25 has such dimensions that it fills entirely the opening in the end wall of the casing 10 over the yokes of the core 11.

The use of U-members 25 in this wise, cuts off the chambers 19 and 20 from the interior of the casing 10 and in effect forms them into separate compartments. By notching the corner of the, U-members 25, as indicated at 27, the leads 28 from the primary 12 may be brought into one compartment, as for instance, at 19, while connection or leads 29 suitable for attaching to an ammeter, led from convenient points on the secondary, are brought into the other compartment, as 20.

These leads 28 and 29 are thus safely housed and retained permanently out of contact with other portions of the secondary or high voltage winding and its main leads, which are here shown as adapted to be connected to the spark gapv electrodes 30 on the cover 31 for the transformer casing.

The casing 10, which I have described, is conveniently provided with a base 32, made of wood and is shown as clamped in place by bolts 33.

A casing constructed in this manner has a minimum of internal clearance from the electrical apparatus contained therein, so that the oil or other insulating fluid contained in the casing is also a minimum, yet at the top where the heated oil. rises, the surface is made sutliciently great to provide ample radiation.

In the winding diagram of Fig. 5, I have shown the transformer as connected to a self-rectifying X-ray tube T, since my 1nvention as applied to transformers will be most commonly used in this connection. The primary leads are shown in this figure at 28 and would be brought into one compartment formed by a U-member to keep them away from the main leads ill of the secondary windings. The leads 29 to the milli-ammeter are here shown as coming from the mid-portion of the windings which are in series with the milli-ammeter.

While I have here shown an embodiment of my invention which is at present the best means known to me for carrying the same into effect, I would have it understood that this is merely illustrative and that I do not mean to be limited thereby to the precise details here disclosed since obvious alterations thereof will appear to those skilled in this art, nor in the choice of recognized equivalents except as defined in my claims hereunto annexed.

hat I claim as new and desire to secure by Letters Patent of the United States, is 2- 1. In transformers or the like, the combination with a core, provided with a winding, a casing provided with a channel portion in which said core is seated and a belled-out portion following the contour of the winding, and a combined core anchoring and lead protecting device.

2. In transformers or the like, the combination with a core provided with a winding, a casing provided with a channel portion in whlch said'core is seated, and a belled-out portion adjoining said channel portion, and a core anchoring device fitted into said channel portion so as to form a flush surface with the surface of the wall of the adjoining belled-out portion.

3. In transformers or the like, thetcombination with a core provided with a wind-' ing, a casing provided with a channel portion in which said core is seated, a belledout portion adjoining said channel portion, and a flush interior surface in the casing adjacent said channels, and a member fitted into the channel portion above said core forming compartments forleads.

4. In transformers or the like, the combination with a core provided with a winding, a casing provided with a channel portion in which said core is seated and a belied-out portion adjoining said channel portion, and a detachable member fitted into said channel portion above said core, forming compartments for leads, and provided with openings to receive said leads.

5. In transformers or the like, the combination with a core provided with a winding, a casing having a channel portion in which said core is seated, at belled-out portion following the contour of the transformer winding, and a U-shaped member fitted into each channel portion above the core so as to form a flush interior surface for the casing and to anchor said core.

6. In transformers and the like, the combination with a core provided with a winding, a casing provided with a channel portion in which said core is seated, and abelled-out portion adjacent said channel portion following the contour of the transformer windings, and a U-shaped member forming lead compartments in said channel above said core and shaped to coact with the interior of said casing so as to form a flush surface therein adjacent said channel portion.

In Witness whereof, I have hereunto set my hand this 26th day of June, 1919.

WILLIAM D. GOOLIDGE. 

